Sponges are animals, they are the simplest group of multicellular animals and one of the oldest living organisms. Although they have no obvious organs and tissue structures, they are truly multicellular animals with characteristics such as cell differentiation, tissue differentiation, and organ coordination. Sponges are distributed in shallow waters of the world's oceans. They are usually attached to rocks or grow in the sediment of the seabed. They have sizes ranging from several centimeters to several meters in diameter. Sponges feed on filtered organic matter and carry out life activities such as respiration, digestion and excretion through the pores and duct systems on the body surface. Like other animals, sponges require oxygen to survive and have the ability to sense stimuli and adapt to their environment.
animal tags： 海绵
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